The FDA has done little to advance the legality of marijuana, but yet again has approved a synthetic THC, syndros, which is only a single cannabinoid compared to marijuana's 70+ naturally occurring cannabinoids. Syndros is the liquid form of dronabinol, which has existed since the 1980's, and while it has the potential to help treat those with pain, nausea, epileptic seizures, Alzheimer's, and much more, many believe that natural marijuana's many cannabinoid's are more effective when working cohesively. The liquid drug was approved as Schedule III meaning it is safe and non-addictive, while marijuana remains Schedule I next to heroin.
Dronabinol has been around since the 1980s. It's generally regarded as less effective for a number of reasons, not the least of which is that it lacks other compounds from natural marijuana that, when mixed with THC, create the effects everyone seems to be willing to break the law to get. The liquid form may be easier for the body to absorb than dronabinol in pill form.
Original article: http://www.popsci.com/fda-approves-synthetic-liquid-marijuana